Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 14

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Question 1
1 / -0

What will happen, When an electric current is passed through a conducting solution?

A
heating of solution

B
chemical reactions within the solution

C
cooling of solution

D
increase in resistance

Solution

When electric current is passed through a conducting solution, some chemical reaction takes place.
Examples:
(a) When electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
(b) When electric current is passed through the solution of a metal salt, such as solution of copper sulphate, metal gets deposited at the negative pole, because metal is positively charged.
(c) Sometimes, the colour of solution also changes when electric current passes through it.
The above examples are some of the chemical effects of electric current. The chemical reaction depends upon the type of solution through which electric current is passed.
Question 2
1 / -0

An electric current can produce

A
heating effect only.

B
chemical effect only.

C
magnetic effect only.

D
chemical, heating, and magnetic effects.

Solution

An electric current can produce magnetic effect on a moving charge as a current carrying wire generate magnetic field in its surrounding.
Current can also produce chemical effect like electrochemical reaction, it can also produce heating effect as it generates heat in a resistance.
Question 3
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Of the following, the one that does not make use of chemical effect of electric current is :

A
Electroplating

B
Electrotyping

C
Thermoelectric refrigerator

D
Voltaic cells

Solution

Thermoelectric refrigerator doesn't use the chemical effect of current whereas all other uses it.
Thermoelectric coolers operate according to the Peltier effect. The effect creates a temperature difference by transferring heat between two electrical junctions. A voltage is applied across joined conductors to create an electric current. ... The main application of the Peltier effect is cooling.
Question 4
1 / -0

Tin cans, used for storing food are made by electroplating:

A
Chromium onto tin

B
Iron onto tin

C
Tin onto iron

D
Chromium onto iron

Solution

Tin cans, used for storing food, are made by electroplating tin onto the iron. Tin is less reactive than iron. Thus, food does not come into contact with iron and is protected from getting spoilt.
Question 5
1 / -0

In LEDs, the longer lead is connected to ................ and the shorter lead is connected to ...................

A
Negative terminal, Positive terminal

B
Positive terminal, Negative terminal

C
Negative terminal, Neutral terminal

D
Positive terminal, Neutral terminal

Solution

In LEDs, the longer lead is connected to the positive terminal and the shorter lead is connected to the negative terminal.
Question 6
1 / -0

Which of the following is not true about LED?

A
There are two wires (called leads) attached to an LED.

B
While connecting to a circuit, the longer lead of LED is always connected to the positive terminal of the battery.

C
While connecting to a circuit, the shorter lead of LED is always connected to the positive terminal of the battery.

D
LED can be used to detect weak current.

Solution

While connecting to a circuit, the longer lead is always connected to the positive terminal of the battery and the shorter lead is connected to the negative terminal of the battery.
Question 7
1 / -0

What happens when you join the free ends of the tester for more than a few minutes?

A
Cells of the battery will drain quickly.

B
The current will not be able to pass.

C
There would be no conduction of electricity.

D
All of the above

Solution

A tester is a conductor of electricity that will conduct for as long as it is connected to the battery, hence when the free ends of a tester are joined for more than a few minutes, current will continuously flow through the tester, draining the battery quickly.

Hence the correct option is A.
Question 8
1 / -0

Which of the following devices can be used to detect a weak current?

A
Use of electric bulb in tester.

B
Use of LED in tester.

C
A tester using magnetic effects of current.

D
Both B and C

Solution

LED glows even when a weak electric current flows through it. Also, even if the current is small, the deflection of the magnetic needle can be seen. Hence, a tester using LED or magnetic effects of current can be used to detect a weak current.
Hence Option D
Question 9
1 / -0

Galvanized iron is coated with a thin coating of

A
Copper

B
Tin

C
zinc

D
Aluminium

E
White lead

Solution

Galvanization of metals is a process of applying a coating of Zinc on metals by electroplating. And that metal is called galvanized metal so galvanized iron is coated with zinc.
Question 10
1 / -0

An experiment is being conducted to test the conduction of electricity through vegetable oil as shown in image. Which of the following statement(s) is correct?

A
The liquid (vegetable oil) allows the electric current to pass through. Since, it is a good conductor of electricity.

B
The circuit of the tester is complete but the bulb does not glow.

C
The circuit of the tester is not complete and hence the bulb does not glow.

D
Both A and B

Solution

Vegetable Oil is an insulator and is a bad conductor of electricity. When the liquid (vegetable oil) does not allow the electric current to pass, the circuit of the tester is not complete and the bulb does not glow.

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Re-Attempt Weekly Quiz Competition

Chemical Effects of Electric Current Test - 14

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Chemical Effects of Electric Current Test - 14

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SHARING IS CARING

Question 1

heating of solution

chemical reactions within the solution

cooling of solution

increase in resistance

Solution

Question 2

heating effect only.

chemical effect only.

magnetic effect only.

chemical, heating, and magnetic effects.

Solution

Question 3

Electroplating

Electrotyping

Thermoelectric refrigerator

Voltaic cells

Solution

Question 4

Chromium onto tin

Iron onto tin

Tin onto iron

Chromium onto iron

Solution

Question 5

Negative terminal, Positive terminal

Positive terminal, Negative terminal

Negative terminal, Neutral terminal

Positive terminal, Neutral terminal

Solution

Question 6

There are two wires (called leads) attached to an LED.

While connecting to a circuit, the longer lead of LED is always connected to the positive terminal of the battery.

While connecting to a circuit, the shorter lead of LED is always connected to the positive terminal of the battery.

LED can be used to detect weak current.

Solution

Question 7

Cells of the battery will drain quickly.

The current will not be able to pass.

There would be no conduction of electricity.

All of the above

Solution

Question 8

Use of electric bulb in tester.

Use of LED in tester.

A tester using magnetic effects of current.

Both B and C

Solution

Question 9

Copper

Tin

zinc

Aluminium

White lead

Solution

Question 10

The liquid (vegetable oil) allows the electric current to pass through. Since, it is a good conductor of electricity.

The circuit of the tester is complete but the bulb does not glow.

The circuit of the tester is not complete and hence the bulb does not glow.

Both A and B

Solution

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